1.  To earn coins – shake on the trees around your resto as well as your friends.

2.  To earn money up to 2k, save your game leaving your restaurant functional (make sure your employees are 100% happy).  Then return after about an hour – when you get back, you’ll earn at least 500 coins depending on how long you left the game.  Close the application save computer resources.

3.  To level up or earn gourmet points, just leave on Restaurant City open while you are working or browsing, then just check the application once in a while.

So far that’s what I have learned.  I haven’t applied other tips I found while googling.

The only complaing I have about this game is it is very frustrating when I encounter different connection problems such as asking me to try again or to update flash player (which I already did) and there seems to be no fix except to try and try until I can access Restaurant City again!  I hope this issue could be fixed.